Plumbing · P-7PGJ3

Underground Pipe Trench Backfill and Cover Detail

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An underground pipe rests on a bed of 1-1/2 inch stone used in areas with wet or unstable bottoms. The haunch and immediate zone around the pipe receive hand backfill using selected loose earth, sand, or gravel compacted to 90 percent compaction. Machine backfill is placed in 6-inch lifts using approved fill material free of large rocks, frozen chunks, debris, or spongy material. The upper zone requires 95 percent compaction up to the finished grade, maintaining a minimum cover of 12 inches, with 24 inches required specifically for gas piping.

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